Scientific Achievements: 1991

Issue Date - March 5, 1991

SG 1546 - Michael Faraday (inventor of electric motor) (Birth Bicentenary), 22p

SG 1547 - Charles Babbage (computer science pioneer) (Birth Bicentenary), 22p

SG 1548 - Radar Sweep of East Anglia (50th Anniversary of Discovery by Sir Robert Watson-Watt), 31p

SG 1549 - Gloster Whittle E29/39 Aircraft over East Anglia (50th Anniversary of Firt Flight of Sir Frank Whittle's Jet Engine), 37p

First Day of Issue Official Covers